| 摘要 |
A system for printing images with improved waterfastness, and methods for printing an image having improved waterfastness are disclosed. The system comprises a first pen containing an ink composition, wherein the ink composition comprises effective amounts of an anionic dye, a polyamine, and an ink vehicle; a second pen containing an acidic fixer composition, wherein the acidic fixer composition comprises an effective amount of an acid and an ink-vehicle. The first pen and the second pen are configured to print the ink composition and the acidic fixer composition, respectively, onto a substrate such that the ink composition and the acidic fixer composition are in contact on the substrate. The amount of acid fixer utilized can be sufficient to protonate substantially all of the polyamines while not protonating the anionic dye, though a lesser or greater amount can also be used with success. |
